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Phil, Mechanical Engineer

Category: HVAC

Satisfied Customers: 5648

Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

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I have an Amana Air Command 80 and I am trying to install a

Customer Question

I have an Amana Air Command 80 and I am trying to install a new thermostat, but the way it's wired is a bit confusing. As you would expect, the white wire goes to the W terminal, a skinny red wire goes to the R terminal, and the green wire goes to the G terminal. What is confusing is that nothing is connected to the Y terminal and the yellow and blue wires are connected together. Also a larger red wire is connected to the C terminal. I always thought a black or blue common wire was connected to the C terminal. Can you explain this wiring configuration to me? Also the old thermostat did not use the blue wire at all. Should I ignore the blue and just connect the yellow wire to the Y terminal on the thermostat?